Jeremy drew a polygon with four right angles and four sides with the same length. Name all the polygons that he could have drawn

Square.

Since a square qualifies as a rectangle, it is also a rectangle.

A rectangle, in turn, is classified as a parallelogram, making it a parallelogram as well.

Equilateral.

Additionally, it serves as a Rhombus.

(While there could be others, these are the few I am aware of.)